Cross slide stop mechanism



June 10, 1952 N. P. DARASH 2,600,213

CROSS SLIDE STOP MECHANISM Filed Jan. so, 1946 2 SHEETS-SHEET 1 F z 'INVENTOR. 3 NIEHDLFIE F DFIR'HSH FITTDR'NEYE June 10, 1952 N. P. DARASH 2,600,213

CROSS SLIDE STOP MECHANISM Filed Jan. 50, 1946 2 SHEETS-SHEET 2 HTTURNEYS Patented June 10, 1952 CROSS SLIDE STOP MECHANISM Nicholas P. Darash, Cleveland, Ohio, assignor to The Warner and Swasey Company, Cleveland, Ohio, a corporation of Ohio Application January 30, 1946, Serial No. 644,350

This invention relates to a stop means for stopping the feeding movement of a tool carrying member of machine tools and has for its chief object to provide a presettable stop means for selectively stopping a movable member of a machine tool at one or more preselected positions thereof.

More specifically, the invention has as its object to provide a selectively presettable stop means for the slide of a lathe, or other machine tool, whereby the slide may be successively stopped at a plurality of positions corresponding to various machining operations performed by the tools carried by the slide. Thus, an operator may perform a plurality of machining operations at a rapid rate without the necessity of repeatedly determining the exact moment when the feeding movement of the slide should stop and the feed controlling lever should be disengaged.

Another object of the invention is to provide a plurality of circumferentially adjustable and rotatable cams, driven in timed relationship with the movement of a slide of a machine tool, and a lever selectively positionable in the path of any one of said cams to stop the feeding movement of the slide at one or more preselected positions.

Another object of the invention is to provide improved means for circumferentially adjusting the position of the rotary cams of a cross slide stop mechanism.

A further object of the invention is to provide limit stops for the cross slide or other movable member of a machine tool in combination with manually settable means to selectively stop said member at one or more, preselected, positions intermediate said limit stops.

The invention may be briefly summarized as consisting in certain novel details of construction and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the accompanying sheets of drawings which illustrate the preferred embodiment of my invention:

Fig. 1 is an end elevation of a portion of a machine tool equipped with the improved stop means;

2 is a front elevation of the apron and carriage of the machine tool showing the power drive for the cross slide and the clutch operating lever therefor;

Fig. 3 is a fragmentary side elevation of the apron and carriage with parts broken away to show the driving connections for the stop mechanism, the view being taken from the right of Fi 2;

14 Claims. (01. 29-65) Fig. 4 is an enlarged fragmentary side eleva itionof the carriage, the top ofthe apron and the lower portion-of the cross slide showing the adjusting means for the stop mechanismg Fig. 5 is a sectional view taken on the line 5' '5 of Fig. 4 showing the construction of myimproved stop mechanism, certain parts being omitted for clarity of illustration; j V

Fig. 6 is a side elevation of the improved-stop mechanism with the cover removedandjparts broken away to show the connections for-releasing the clutch operating lever;

Fig. 7 is a fragmentary view of the rotatable cams and shiftable lever of the improved stop mechanism with the lever positioned at one extreme of its movement to cooperate with thefirst cam, the view beingtaken on line l| of Fig. -6 with certain parts removed for clarity ofillustration; and I a Fig. 8 is a view similar to Fig. showing the shiftable lever moved to its otherextremeposition. Before beginning the detail description ofthe invention it is well to notice that this-device is intended to provide means for automaticallystop ping a movable member of a machine tool at one or more preselected positions thereof, and while the invention is illustrated as being associated with the cross slide of a machine tool it is to be understood that it is not so limited-but may also be used upon the carriage or aturret saddle. Referring now to the drawings,- in Fig. l l have disclosed an end elevational view o'f amachine tool, designated M, with the turret saddle and turret removed for clarity of illustration; The machine tool is of conventional design. and comprises a bed It! having ways for supporting a carriage [2 for movement longitudinally of the machine, an apron l3 fastened to the carriage to move therewith, and a cross slide l4 supported upon suitable ways at the top 'ofthe carriagefor movement transversely of the.machine..vPosi'- tioned upon the apron I3 is the improved stop mechanism, designatedgenerally as-S. The carriage and apron as well as the crossslide. are driven in timed relation with the spindle l5 'by means of a feed shaft [6 and the usual gearing connections, as is well known in the art.

Disposed upon the feed shaft I6 is a worm l! in driving engagement with a worm Wheelj I8 mounted upon the shaft I9 which. also carries a spur gear 20 (see'Fig. 2). Gear. 20 is in driving engagement with a spur gear 2| which carries one element of a clutch mechanism, designated generally by C. The other element of the clutch mechanism is mounted upon a spur gear 2 2fwhic h thereof sliding within and projecting outwardly of the opening 55. Disposed within the opening 55 is a compression spring 58 in engagement with the bushing 21 and the pin head 51 and exertin its force upon the head to keep it in positive engagement with the lower end of arm 54. This arrangement effects rocking of the lever 52 so as to maintain it in constant engagement with arm of the cam-actuated lever 48 to rock the latter to maintain the arm 49 thereof in constant en-- gagement with the peripheral surface of a cam ring 34. Hence, when a cam comes into contact with arm 49 it will be rocked thereby in the opposite direction thus causing arm 5| to rock lever 52 and move pin 56 against the action of spring 58. As pin 56 moves outwardly through the opening in bushing 21, it displaces pin 26 whereupon clutch lever 25 will rock downwardly to disengage the clutch and stop the movement of the cross slide.

To provide for longitudinal adjustment of the cam-operated lever 48 for successive cooperation with each of the cam rings 34, the sleeve 58 is provided with an obliquely projecting stud 59 which has a roller 60 mounted on its outer end. The roller 60 is engaged in an endless cam groove 6| located in an indexible drum 62 which is mounted upon a shaft 63 and fixed thereto by means of a screw 64 for rotation therewith. The shaft 63, journaled in the two-part housing 65 for the stop mechanism S, extends parallel with the axes of shaft 41 and drum 33, and also extends beyond the forward part of the housing 65 of the stop mechanism. The two parts of the housing 65 are secured together by means of suitable screws. On the outwardly extending end of shaft 63 is attached a manually operable knob 66 provided with an extension 61 forming a dial bearing suitable indicia corresponding to that upon the outer ends of the rods 39. A suitable indicium mark or pointer 68 is carried by the housing 65 of the stop mechanism and cooperates with grooves or similar marks 69 on the dial portion 61 extending in alignment with the indicia thereon. Disposed within a recess in the dial portion 61 is a spring-actuated detent 18 which cooperates with recesses ll provided upon the face of the housing 65 and circumferentially spaced about the shaft 63. The recesses are equal in number to the number of cam rings and each recess correspond to a dial indicium.

In order to select a particular cam ring for actuation of the stop mechanism the operator grasps knob 61 and rotates it until the indicium thereon corresponding to that borne by the selected cam ring as evidenced by the corresponding indicium on the end of rod 39 is in line with pointer 68. This eifects rotation of drum 62 causing cam-groove 6| to move stud 59, and hence lever 48, longitudinally along shaft 41 and thus position arm 49 upon the indicated cam ring 34. Figure 7 shows one position of lever 48 with its arm 49 riding upon the first of the cam rings 34, while Fig. 8 illustrates the lever 48 as having been moved to its other extreme position with the arm 49 now in engagement with the last cam ring. It will be seen from these figures that the lower arm 5| of the cam-actuated lever 48 is of such extent as to remain in engagement with the upper end of lever 52 throughout the entire range of longitudinal movement of the lever 48 thereby maintaining the lever 48 in operative engagement with the clutch disengaging means at all times.

Additional stop means are provided for the I purposes of defining the extreme position's'of the cross slide. Thi additional stop Inf-39.11500!!!- prises a pair of dogs 12 which are adjustably secured to the cross slide and, have downwardly extending cam-shaped portions 13 for engagement with the top of a pin 14 extending upwardly from the stop mechanism S. The said pin-14 is received in a vertical bore of an enlarged portion of the stop mechanism housing and adjacent the lower end of pin 14 is an enlarged opening communicating with an obliquely directed opening also provided in the enlarged portion of the housing. A pin 15 slides within the obliquely directed opening and has a cam face at its upper end cooperating with a similar cam face 'upon the lower end of pin 14 disposed with the above mentioned enlarged opening. The lower'end of pin 15 contacts an upstanding longitudinal extending shoulder 16 provided on leeve 58 of lever 48. The construction is such that when the cross slide l4 has reached one of its extreme positions, one of the cam faces 13 on a dog I2 will contact the upper end of pin 14 depressing it and thus forcing pin 15 against shoulder 16 so as to rock lever 48. The rocking of lever 48 will, as above described, rock lever 52 forcing pin 56 outwardly through the opening in bushing 21 and thus displace pin 26 carried by the clutch lever 25. The clutch controlling feed lever 25 will thereupon rock downwardly to disengage the clutch and stop the movement of cross slide [4.

Mounted upon the cross slide I4 is a tool supporting turret 11, shown here as of the square type, for supporting a plurality of tools for successive machining operations upon a workpiece mounted on the machine tool. As is understood in the art, any one of the tools may be employed to perform more than one operative step in a machining cycle and hence, while the present disclosure shows an indexible support for receiving four tools, it is desirable to provide automatic stop means of greater number than'the number of tools in order that there may be more than one operation performed by each tool. It is obvious that indexible tool supports other than the square type could also be employed and a correspondingly different number of camming rings 34 would then be used.

In setting up the machine tool for a machining cycle in accordance with this invention, the operator will first mount the desired tools upon the indexible tool holder 11. Having indexed the tool holder to place one of such tools in operative position, he will then move the cross slide by means of the manually actuated hand wheel 18 to the position at which the feeding movement of the cross slide and tool holder should stop. It will be understood that during this setting-up operation the spindle will not be in operation and the feed shaft IE will not be rotating. The feed controlling lever 25 is then lifted and pin 26 carried thereby is inserted in the opening of bushing 21. The operator then grasps knob 66 and sets the dial 6'! so that the numeral I is in alignment with pointer 68., This will position arm 49 of lever 48 upon the first cam ring 34. He will then place a wrench or other suitable tool upon the polygonal head 46 of rod 39 bearing numeral I, press inwardly slightly, and rotate the rod 39 until cam projection'35-has moved into engagement with arm 49. This point will be determined by the fact that cam '35 will rock levers 48 and 52 to force pin V 56 outwardly through the opening in bushing 2'! thusdisplacthe-cross slide.

a etat .in pinrgifi'and allowing the feed controlling lever 15 .tovdropi downwardly. -When the machining *operation is being effected by a forward movementof the cross slide 'theadjustment of cam ring should beeffected by rotating the rod 39 -.ln one-directionwhereas if the machining operationisto be performed bythe reverse movement ofvthe. cross slide. the camrring 34. should ..be-adjusted by rotating the rod39 in the reverse direction.

.Havingset up the stop mechanism for one cam =35 has been properly. adjusted to engage arm49.

With .the apparatus thus setup, the cross. slide is moved to itsstarting position, knob 66 is turned .nntilthe, numeral Lon dialBl is in alignment ,with pointer .68, the spindle i .and feed shafts l6 areplaced sin operation,.and the feed. con- .trolling lever 25..is moved upwardly, and its pin liagain idisposedin the recessof bushing 27. .Feeding of .the cross slide willthereupon begin and continue until the tool has completed the first machining operation whereupon the first cam ring strikes arm 49 to .knock out pin 2,6.to allow the feed controlling lever 25 to drop thus disengaging the clutch C and stopping feed- .ing of the cross slide, The operator then turns ,knob 56 to bring the next numeral on dial portion' 61 into alignment with pointer 58 thus moving arm49 to cooperate with the next cam ring 34.

He then indexes tool holder 11. to bring the next tool ,into cutting position, and reengages clutch C by moving the feed controlling lever "25 to bring pin'ZB into the opening of bushing :21. i Feeding movement is again imparted to the cross slide I4 and continues until the second 'ma'chining operation iscompleted and the corresponding cazn35 strikes arm 49 to again knock outpin 26 of feed controlling lever 25 to disengage the clutch and stop the movement of carrier,- turning dial 61 to the-corresponding position, 'reengaging the clutch bymoving the feed controlling-lever, and the subsequent "knock out thereof are repeated until the complete machining cycle is finished.

While my invention hasbeen-disclosed for purpose of illustration as comprising six-camor stop rings to provide a corresponding number 20f stepsof machining operations, it will be apparentthat a greater orlesser number ofsuch stop rings can be employed depending upon -the number of steps it is decided toexecute. If

itbexdecided to eifect machiningoperations entirely by hand control, dial 61 is placed, for example; at itsfirst position and left there throughoutthe operation. In such an instance the cam ring 34, corresponding tothe set position for arm Has-indicated: by dial 61, will be set so that itscam 35'will correspond to an extreme position of the cross slide.

The dogs 12 and pins 14 and 15 are provided as .asafety-means to stop the cross slide at its extremes; of movement if the operatorshould neg- .lect to dissengage the feed controlling lever ,when

themachine is being used for manual operations.

These steps of indexing the tool- ,,means forstopping the movement of said slide in :slide, driving meansfor moving said slide and It will be apparent. that bythe use of my. in-

.vention multiple steps of a machine operation maybe rapidly and eificiently performed by a less skilled operator than has heretofore been possible with resulting economy of time and a considerable reduction in expense.

While I have shown a preferred embodiment of the invention I do not. wish to be confined to the precise details illustrated, but desire to cover all modifications coming within the spiritand ,scope of my invention as set forth in the claims.

Having thus described my invention, 1 claim: 1. In a machine tool of the type described, a

slide, a tool holder carried by said slide, drivin means for moving said slide and tool holder,

each of a plurality of preselected positions there- .of comprising, a plurality of individual camming means, a common support forsaid cammin means, means to rotate said support and camming means in timed relationship with the movement'of said slide,-and means to disengage said driving means including a movable member and manually operable means independent of said toolholder for selectively positioning said memher in the path of any one of said camming means tobe moved thereby to effect the disengagement of the driving means.

2. In an apparatus of the type described, a cross slide,'a tool holder carried by said cross tool holder, means for stopping the movement 'ofsaid slide in each of a plurality of preselected positions thereof comprising, a plurality of individuallyadjustable cams, means to rotate said cams in timed relationship with the movement of the cross slide, means to disengage said driving means including a rockable lever, and means for-selectively positioning one arm of said lever .in the path-of: any one of said cams to-be rocked thereby for effecting disengagement of said drivingmeanswhen said slide has reached thecorresponding preselected position.

3., Ina-machine tool-of the type described, a slide, a support-for said slide, a drive carried byrsaidgsupport for moving said slide, a clutch comprising drivingand driven members in said drivemeans for stopping the movement of said slide in eachof aplurality of positions including, a plurality of rotatable cams, a common support for said cams, an operative connection 7 between said support and said driven clutch member to rotate said support and cams in timed relationship with the movement of the slide, a movable member, means manually operable for selectively positioning said movable .member axially of said support in the path of any one of said cams to be engaged and actuated thereby -when'the latter is rotated by movement of said slide, and an operativeconnection between'said movable member and said clutch to disengage the clutch when'said movable member is actuated.

4. In an apparatus of the-character described,

a-movable slide, a power drive tomove said slide, 'aclutch interposed in said'power drive, means including a lever for disengaging said clutch, a plurality of cam rings, means to rotate said cam ringsin timed relationship to the movement of said slide, means to individually adjust said cam rings, a shaft for pivotingthe said lever, means to movesaid lever along said shaft to selectively positionone arm of the lever in'the path of any one of said cams while retaining its other arm in engagement with the clutch disengaging means whereby the lever may be rocked by the cam in whose path it is positioned .to disengage the clutch and stop the slide.

5. In a machine tool of the type described, a movable cross slide, an indexible tool holder mounted upon said cross slide and adapted to support a plurality of tools, power driving means to move said cross slide, a clutch interposed in said drive means, and means to disengage said clutch and stop the movement of the slide at one or more preselected positions thereof comprising, a drum, means to rotate the drum in timed relationship to the movement of the cross slide, a plurality of cam rings mounted on said drum for rotation therewith, a lever, a support for mounting said lever adjacent said drum for rocking movement transversely of the drum, said lever being movable along its support and having one arm of greater width than the other, means in-engagement with the wider arm of the lever tooperate the clutch disengaging means, and means tomove the lever along its support to selectively position its narrower arm in the path of any one of said cams.

6. A machine tool as defined in claim and further comprising means to individually adjust the angular positions of each of said cam rings.

7. In a machine tool of the type described, a slide,'a support for said slide, a power drive carried by said support for moving said slide, a clutch interposed in said drive, a lever for engaging said clutch, means on said clutch lever and said support to retain said lever in clutch engaging position, and means to release said clutch lever retaining means at one or more preselected positions of said slide comprising, a plurality of rotatable camming means, a common support for said camming means, means to rotate said support and camming means in timed relationship with the movement of said slide, a cam-actuated member, means manually operable to selectively move said member axially relative to said support into the path of any one of said camming means for engagement thereby when the latter is rotated, and an operative connection between the cam-actuated member and the clutch lever retaining means to release the clutch lever when the slide has reached any of said preselected positions.

8. In an apparatus of the character described,

a cross slide, power driving means to move the cross slide, a clutch interposed in said driving means, means for disengaging said clutch, a plurality of coaxially mounted cam rings, means to adjust the angular position of each of said rings, means to rotate said rings in timed relationship with the movement of said cross slide, an arm mounted for rocking movement adjacent said rings, means to move said arm into operative relationship with any one of said rings, a second arm engaging said clutch disengaging means, said arms being operatively connected to rock together whereby, when the first mentioned arm is engaged by the cam in whose path it is positioned, the clutch will be disengaged by said other arm and the slide stopped at a preselected position. 9. The apparatus of claim 8 further comprising, a plurality of dogs adjustably carried by said cross slide, a depressible rod in the path of said dogs, and an operative connection between said rod and the clutch disengaging means to stop said cross slide at predetermined limits of its movement.

'10. In a machine tool having a tool support, driving means to move said support,a clutch in the driving means, and-means to disengage the clutch, the improvement which comprises, a drum rotated in timed relationship with'the movement of the tool support, said drum having a plurality of openings spaced about the circumference thereof, a plurality of cam rings mounted on said drum to rotate therewith andrelative thereto, gear teeth upon the internal circumference of each of said rings, the gear teeth of each cam ring being in alignment with one of said openings in the drum, a plurality of spur gears journaled in the drum with the teeth of each one of said spur gears projecting through one of said openings and-meshing with the teeth on the corresponding cam' ring, means for individually turning each spur ear to adjust the position of the corresponding cam -ring, a rockable and shiftable lever mounted adjacent said drum with one arm thereof in continuous -engagement with the clutch disengaging means and the other arm selectively cooperable with any one of said rings, and means to shift said lever to position said last mentioned arm in the path of any one of said cam rings.

11. In a machine tool having a tool support, a power-operated driving means to move said support, a clutch interposed in the driving means, and means to disengage the clutch, the improvement which comprises, a drum, means to rotate the drum in timed relationship with the movement of the tool support, a plurality of cam rings mounted on said drum to rotate therewith and relative thereto, gear teeth upon the internal circumference of said rings, said drum having a plurality of openings in its circumference, there being an opening in alignment with the teeth on each ring with said openings being spaced circumferentially about the drum, a plurality of rods journaled in the drum, a spur gear on each rod projecting through one of said openings and meshing with the teeth on the corresponding ring, means on the end of each rod to rotate it and its corresponding ring, a shaft extending parallel with said drum, a lever journaled on said shaft for rocking thereabout and for sliding movement therealong, means to move said lever along the shaft to selectively dispose one arm thereof in the path of any one of said earns, the other arm of said lever being of sufficient size to remain in engagement at all times with the means to disengage the clutch whereby, when the first mentioned arm is moved by a cam, the lever will be rocked to disengage the clutch and stop the movement of the tool support.

12. In a machine tool of the type described, a cross slide, driving means for moving said slide, means for stopping the movement of said slide in each of a plurality of selected positions there- I of comprising, a rotatable supporting member,

11 retain the ectuator end' the coqperatihg cam in anedjusted position;

13; The combination-as defined inclaim 12 wherein said *actuators'are axially I movable and rotatable relative to said. member and the-means for retaining the said-actuators-and cams in adjusted position comprise nci'mally engaged cooperating-fricticn suriaces on saidactuators and members,- thesaid surface on each actuator be ingse1ective1y disengaged from the cooperatin surface on-seid memberby-axia'l movementef -the actuator in onedirection thus permitting rota,- ticn thereof for-effecting adjustment of the correspcnding cam.

14; The combination as defined in c1aim-12 and wherein-the saidseparate actuators are axially movable-and rotatable r'elativeto said member, a; gearing connection-betweeneach cf saidactuators and; the'eo'rresponding' cam, means biasmg each actuate! "into locking engagement with said member to" thereby restrain the actuators from rctationand retain the correspondingcams in'their-ad'justed positions, and means on each 12 actuetoeby which the saidactuators maybe individually; axiafly moved to release-thexlceke ing engagement with "saidmemher and rotated while released to the eby adjust the corresponding cam;

NICHOLAS P. DARASH;

REFERENCES CITED The renew ng refe n e r o vr co in th j e of hispa e t;

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